User's Manual

Monitoring with the TD60 at the CS Arrhythmia Monitoring
TMS60 Operator’s Manual 9 - 27
9.6 Arrhythmia Monitoring
9.6.1 Measurement Limitations
■ Since the arrhythmia detection algorithm sensitivity and specificity is less than
100%, sometimes there may be some false arrhythmias detected and also some
true arrhythmia events may not be detected. This is especially true when the
signal is noisy.
■ The ECG size and QRS width settings affect arrhythmia detection and heart rate
calculation sensitivity.
■ If QRS amplitude is low, the monitor might not be able to calculate HR and false
asystole may occur.
■ At the algorithm learning phase, arrhythmia detection may not be available.
Therefore, closely monitor the patient’s condition during the learning phase and
after the learning phase to allow the algorithm to reach optimal detection
performance.
9.6.2 Understanding the Arrhythmia Events
9.6.2.1 Mindray ECG Algorithm
WARNING
• The arrhythmia analysis program is intended to detect ventricular
arrhythmias. It is not designed to detect atrial or supraventricular
arrhythmias. It may incorrectly identify the presence or absence of an
arrhythmia. Therefore, a physician must analyze the arrhythmia infor-
mation with other clinical findings.
• Heart-rate reading may be affected by cardiac arrhythmias. Do not rely
entirely on heart rate alarms when monitoring patients with arrhyth-
mia. Always keep these patients under close surveillance.
Arrhythmia message Description Category
Asystole No QRS detected within the set time threshold in absence of ven-
tricular fibrillation or chaotic signal.
Lethal
arrhythmia
VFib/VTac A fibrillatory wave for 6 consecutive seconds.
A dominant rhythm of adjacent Vs and a HR > the V-Tac HR limit.
VTac The consecutive PVCs ≥ Vtac PVCs limit, and the HR ≥ the Vtac rate
limit.